Magnetic mounting with force compensation

Abstract

The aim of the invention is to better compensate for specifiable forces on a magnetic mounting. This is achieved by a magnetic mounting device with a first magnet device ( 10 ), which is designed in an annular manner and which has a central axis, for retaining a shaft on the central axis in a rotatable manner by means of magnetic forces. The magnetic mounting device additionally has a second magnet device ( 12 ), which is independent of the first magnet device ( 10 ), for compensating for a specifiable force acting on the shaft. In this manner, the magnetic mounting device can compensate for the gravitational force or forces based on imbalances.

The invention claimed is: 
     
       1. A magnetic bearing device, comprising:
 an annular first magnet device defining a central axis and configured to rotatably retain and center a shaft on the central axis by magnetic forces; 
 an annular second magnet device arranged independently of the first magnet device in concentric relationship to the first magnet device and configured to compensate for a specifiable force acting on the shaft and to counteract a gravitational force, wherein only the second magnet device has a permanent magnet, said permanent magnet being composed of a plurality of individual magnets and having an arc-shaped design when viewed in an axial direction, said permanent magnet being spaced radially from the central axis of the first magnet device by an adjustable spacing between the second magnet device and central axis to compensate for the specifiable force, spacing is adjusted by a screw and further comprising a first control device integrated in the magnetic bearing device and configured to regulate the spacing, and 
 a first converter configured to actuate the first magnet device, and a second converter configured to actuate the second magnet device, 
 wherein the first magnet device has a first coil system with a plurality of pole pairs, and the second magnet device has a second coil system with a plurality of pole pairs which is less than the number of pole pairs of the first coil system by a value of precisely one. 
 
     
     
       2. The magnetic bearing device of  claim 1 , wherein the specifiable force is the gravitational force, said second magnet device having a second control device configured to regulate the second magnet device to compensate for the gravitational force acting on the shaft. 
     
     
       3. The magnetic bearing device of  claim 1 , wherein the specifiable force is caused by an imbalance of or on the shaft, said second magnet device having a second control device configured to regulate the second magnet device to compensate for the specifiable force.